Support arm



FIG. 1 is a perspective view of a support arm showing our new design ina first position;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a right side elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof;

FIG. 8 is a perspective view of the support arm of FIG. 1, in a secondposition;

FIG. 9 is a front view thereof;

FIG. 10 is a rear view thereof;

FIG. 11 is a right side view thereof;

FIG. 12 is a left side view thereof;

FIG. 13 is a top view thereof; and,

FIG. 14 is a bottom view thereof.

The broken lines that are immediately adjacent to the claim, and defineunshaded regions, represent the bounds of the claim and are not includedin the claim, while all other broken lines are directed to environment;the broken lines form no part of the claimed design. In addition, theunshaded surfaces throughout the views that directly adjoin the claimedsolid line edges shown in the views form no part of the claimed design.

CLAIM The ornamental design for a support arm, as shown and described.